About: Step-like enhancement of luminescence quantum yield of silicon nanocrystals

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Carrier multiplication by generation of two or more electron-hole pairs following the absorption of a single photon may lead to improved photovoltaic efficiencies and has been observed in nanocrystals made from a variety of semiconductors, including silicon. However, with few exceptions, these reports have been based on indirect ultrafast techniques. Here, we present evidence of carrier multiplication in closely spaced silicon nanocrystals contained in a silicon dioxide matrix by measuring enhanced photoluminescence quantum yield. As the photon energy increases, the quantum yield is expected to remain constant, or to decrease as a result of new trapping and recombination channels being activated. Instead, we observe a step-like increase in quantum yield for larger photon energies that is characteristic of carrier multiplication. Modelling suggests that carrier multiplication is occurring with high efficiency and close to the energy conservation limit. Carrier multiplication by generation of two or more electron-hole pairs following the absorption of a single photon may lead to improved photovoltaic efficiencies and has been observed in nanocrystals made from a variety of semiconductors, including silicon. However, with few exceptions, these reports have been based on indirect ultrafast techniques. Here, we present evidence of carrier multiplication in closely spaced silicon nanocrystals contained in a silicon dioxide matrix by measuring enhanced photoluminescence quantum yield. As the photon energy increases, the quantum yield is expected to remain constant, or to decrease as a result of new trapping and recombination channels being activated. Instead, we observe a step-like increase in quantum yield for larger photon energies that is characteristic of carrier multiplication. Modelling suggests that carrier multiplication is occurring with high efficiency and close to the energy conservation limit. (en)
Title	Step-like enhancement of luminescence quantum yield of silicon nanocrystals Step-like enhancement of luminescence quantum yield of silicon nanocrystals (en)
skos:prefLabel	Step-like enhancement of luminescence quantum yield of silicon nanocrystals Step-like enhancement of luminescence quantum yield of silicon nanocrystals (en)
skos:notation	RIV/00216208:11320/11:10109245!RIV12-AV0-11320___
http://linked.open...avai/predkladatel	Matematicko-fyzikální fakulta
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(KAN400100701), P(LC510), Z(MSM0021620835)
http://linked.open...iv/cisloPeriodika	11
http://linked.open...vai/riv/dodaniDat	2012
http://linked.open...aciTvurceVysledku	Valenta, Jan
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Univerzita Karlova v Praze / Matematicko-fyzikální fakulta
http://linked.open...dnocenehoVysledku	232349
http://linked.open...ai/riv/idVysledku	RIV/00216208:11320/11:10109245
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	exciton; quantum yield; luminescence; silicon; Nanocrystals (en)
http://linked.open.../riv/klicoveSlovo	Nanocrystals quantum yield exciton luminescence silicon
http://linked.open...odStatuVydavatele	GB - Spojené království Velké Británie a Severního Irska
http://linked.open...ontrolniKodProRIV	[DE43F1AC2C22]
http://linked.open...i/riv/nazevZdroje	Nature Nanotechnology
http://linked.open...in/vavai/riv/obor	BH
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	5 (xsd:int)
http://linked.open...vavai/riv/projekt	Center of nanotechnology and materials for nanoelectronics Functional hybrid nanosystems of semiconductors and metals with organic materials (FUNS)
http://linked.open...UplatneniVysledku	2011
http://linked.open...v/svazekPeriodika	6
http://linked.open...iv/tvurceVysledku	Valenta, Jan Timmerman, D. Dohnalova, K. Gregorkiewicz, T. de Boer, W. D. A. M.
http://linked.open...ain/vavai/riv/wos	000296737300008
http://linked.open...n/vavai/riv/zamer	Fyzika molekulárních, makromolekulárních a biologických systémů
issn	1748-3387
number of pages	4 (xsd:int)
http://bibframe.org/vocab/doi	10.1038/NNANO.2011.167
http://localhost/t...ganizacniJednotka	11320
is http://linked.open...avai/riv/vysledek of	Step-like enhancement of luminescence quantum yield of silicon nanocrystals Step-like enhancement of luminescence quantum yield of silicon nanocrystals

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